Use of the HITCH code to evaluate amines as neutralizers of crevice acidity in nuclear steam generators. [PWR]

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6080559

Pyo, J K; Leibovitz, J; Sawochka, S G

The HITCH computer code was updated to facilitate calculations at various temperatures for various acid neutralizing amines, to widen its range of applications practically accessible for potential users, and to reduce the time and costs for investigating such applications. The updated code was applied to the investigation of selected amines as neutralizers of acid in steam generator crevices where denting occurs as a result of the acidity. No appreciable difference was found between ammonia and the amines considered in their effect on crevice solution pH with seawater inleakage yielding a steam generator bulk water chloride concentration of 7 ppM. At normal operating blowdown chloride levels (20 to 50 ppB), quinuclidine had a significant effect on controlling crevice acidity over a wide range of crevice concentration factors. At high chloride concentration, e.g., 7 ppM, a combination of amine properties suitable for the neutralization of the crevice acidity would raise the pH to possibly excessive values in the absence of impurities. Thus, addition of an amine suitable for crevice acidity control at high bulk water chloride levels, if it exists, would have to be adjusted to the size of the leak.

• Research Organization: NWT Corp., San Jose, CA (USA)
• OSTI ID: 6080559
• Report Number(s): EPRI-NP-3851; ON: TI85920213
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210200* -- Power Reactors
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AMINES
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COMPUTER CALCULATIONS
CORROSION DENTING
DEFORMATION
ORGANIC COMPOUNDS
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PWR TYPE REACTORS
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WATER CHEMISTRY
WATER COOLED REACTORS
WATER MODERATED REACTORS